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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 793 · 40 questions
TalentJR

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

NameDateTime takenScore ___ / 40
  1. 1.?691 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.1?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?402 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.56?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?740 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.632? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?247 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 46 and take away the sum of its digits. What do you get?
  9. 9.5?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?470 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.1?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.41?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.32?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 80 and take away the sum of its digits. What do you get?
  17. 17.570? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 19 and take away the sum of its digits. What do you get?
  19. 19.30?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 61 and take away the sum of its digits. What do you get?
  21. 21.?075 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?634 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.237? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 25 and take away the sum of its digits. What do you get?
  25. 25.?715 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.21?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 33 and take away the sum of its digits. What do you get?
  29. 29.Take 62 and take away the sum of its digits. What do you get?
  30. 30.?120 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.4?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 96 and take away the sum of its digits. What do you get?
  33. 33.180? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?705 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.1?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.553? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?062 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 44 and take away the sum of its digits. What do you get?
  39. 39.Take 87 and take away the sum of its digits. What do you get?
  40. 40.7?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 2
  2. 8
  3. 3
  4. 1
  5. 7
  6. 7
  7. 5
  8. 36
  9. 1
  10. 4
  11. 7
  12. 2
  13. 7
  14. 3
  15. 2
  16. 72
  17. 6
  18. 9
  19. 1
  20. 54
  21. 6
  22. 5
  23. 6
  24. 18
  25. 5
  26. 8
  27. 2
  28. 27
  29. 54
  30. 6
  31. 5
  32. 81
  33. 9
  34. 6
  35. 8
  36. 5
  37. 1
  38. 36
  39. 72
  40. 4

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